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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
If sleep is mysterious, REM sleep is even more mysterious. REM phemonmena has wormed its way into folklore over the centuries because the brain is active and the skeletal muscles have no tone. The muscles associated with breathing are not paralyzed, but breathing in REM is shallower and more rapid.he first REM period happens 70 to 90 minutes after sleep onset. At first these REM episodes are short (a few minutes), but as the night progresses, they become longer. Most REM sleep is late in the main sleep period (close to morning). A typical adult spends about an hour and a half every night in REM.